Improvement in sewing-machines



J. E., J; C. & O. ATWO0D..

, Sewing'Machih'e.

No. 19,903. Patented April 13. 1858.

' Whi ch complete.

, with said bed-piece to contain the needle-bar The wrist-plate F, towhich the wrist a is at- A UNITED STATES .T. ATWOOD, J. o. Arwoon, AND0. ATWOOD, or MANSFIELD CENTRE,

PATENT OFFICE. A

CONNECTICUT.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming partof Letters Patent No. 19,903, dated April 13,1853.

To all whom it may concern:

Be it known that we, J. E. ATWOOD, J. O. ATwoon, and O. A'rwoon, ofMansfield'Gentre, in the county of Tolland andState of Oonneeticut, haveinvented certain new and useful Improvements in Sewing-Machines; and wedo hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming part of this specification, in

Figure 1 is a side view of a machine with our improvements, representingpart of the table cut away to expose the mechanism which makes thestitch. Fig. 2 is a front view of the machine. Fig. 3 is an invertedplan of the same. Fig. 4. shows a face view of the needledie, and alsoexhibits the looper and needle. Fig. 5 is a perspective view of theneedle-die Fig. 6 is a perspective view of the movable portion of thesame. Fig. 7 is a front view of the cam by which the looper is operated.Fig. 8 is atop view of the needle-die, the looper, and the finger whichconfines the loop to the looper, while the looper holds it open for theneedle to pass through.

Similar letters of reference indicate corresponding parts in the severalfigures.

Our invention consists in a novel arrangement of a needle-die, looper,and stationary finger, in combination with an eye pointed needle to sewthe chain-stitch witha single thread without missing any stitches.

To enable others to make and use our invention, we will proceedtodescribe its con struction' and operation.

A is the bed-piece of the machine, on which the cloth or other materialis placed to be": sewed, and B is a goose-neck standard cast anddriving-shaft.

O is the needle-bar, working vertically and carrying the needle n. I

D is the driving-shaft, arranged horizontally.

E is a'connecting-rod connecting the needlebar with a wrist, a, attachedto the drivingshaft, and serving to drive the needle-bar.

tached, has its periphery formed to serve as a cam to operate thefeed-lever G and its attacheddog P, the latter of which takes hold ofthe upper surface of the cloth.

H is the needle-die, shown separately in Fig. 5, and also shown in Figs.1, 3, 4: and 8. The cavity 0 in the said die, through which the needlepasses, is made partly in the stationary portion b of said die H andpartly in the movable portion (1 thereof. The division of the die is atright angles to its face 9. Both parts b and d of the die are secured toa plate, I, which is bolted by screw-bolts e to the under side of thebed-piece, the part I) being secured immovably to the said plate, andthe movable part d being pivoted by a screw or pin at f, near its back.The face. 9 of the said die, against which the looper works, is parallelwith the needle, and the cavity 0, in which the needle works, is soclose to this face that though the horizontalsection of said cavity is asufficient portion of a circle to confine the needle the said cavityunites with the face 9, so as to leave the side of the needle which isnext the face 9 in passing through the die flush with said face orprojecting slightly beyond it, so that the looper in working close tothe face of the die cannot fail to pass between the needle and itsthread. A spring, *h, is applied to the movable portion (1 of the die topress it to ward the portion 1) or close it, so that it may always fitthe needle tightly and adapt itself to needles of various sizes. Behindthe cavity 0, which receives the needle, there is a narrow cavity, 1',in the part d, to receive any thread that may get slack in the groovedside of the needle, which side is arranged the farthest from the face ofthe die. This needledie, with the exception of being made in two parts,does not differ very materially from the needle-die heretofore used insome machines. The face 9 of the die is set'at an angle of aboutforty-five degrees to the direction of the feed movement, as shown inFigs?) and 8, where the direction of the feed movement is indicated byarrows. The said movement is toward the said face.

j is the looper, consisting of a curved tonguelike piece of steelattached to or formed in a piece with a small arm, k; which is attachedto a sleeve, Z, that is fitted to turn loosely on a fixed horizontalpin, m, secured in the bedpiece A at one side of the die, the said pinbeing arranged at a right angle to the face of the needle-die, and thelooper being nearly in the form of an are described from the pin m, andarranged so that its point will work in contact with the face 9 of thedie. The looper j is held in contact with the face by means of a spring,19, applied to its arm-k. It derives the necessary vibrating movement onthe pin on to cause it to pass between the needle and thread from alever, J, which works 011 afulcrum, q, under the bed-piece A, one end ofthe said lever entering a hole in the arm 7c, and the other beingconnected with the standard 13 by a spring, 1, and having resting up'onit a sliding rod, 8, which is operated upon by a cam, K, (of which Fig.7 is the front view,) in such a manner as to cause a vibratory motion ofthe lever, which is kept to a bearing. on the cam by means of the springa", which eX- erts its force in an upward direction. tis the stationaryfinger, arranged under the bed piece A close to the needle-hole u, forthe purpose of confining the loop to the point of the looper while theneedle passes through it.

The operation of the .machine is as follows: As the needle descendsthrough the cloth its point will not fail to enter the die, and it willforce itself through the die without difficulty, as the spring h is notnecessarily very strong, for the pressure of the looper against theneedle pushes it toward the back of the die 'and toward the part b. Theprincipal pressure is toward the back of the die, and though this is metby both parts b and d of the die it has little tendency to force themovable part (2 away from b. The looper is stationary in the positionshown in Figs. 1 and 4 till after the needle has completed its descentand has commenced to rise and leave the thread slack on that side whichis exposed at the slit 1:, (see Fig. 5,) which is formed by the junctionof the cavity a with the face 9 of the die; but as soon as the needlehas risen a little way the looper begins to move 011 the pin m andcrosses the slit 1;, thus passing between the needle and the slackthread. The position of the looper does not enable it of itself toretain a loop, as will be seen by reference to Fig. 4, in which it isshown in dotted outline in its highest or most advanced positionybut inmoving to the last-named position its point passesthe finger t, andhence as the needle continues to rise and draw up the thread the threadis prevented from slipping over the point of the looper by the saidfinger and retained thereon in the form of a loop, which, owing to theinclined position of the face of the die relatively to the direction ofthe feed motion, and to the looper working parallel to the said face, itholds open in such a position (illustrated in Fig. 8) that the needle inits next descent passes through it with certainty, and thus completesthe stitch.

We do not claini the use of a die to guide the needle and hold it steadyagainst the action of the looper; but

What we claim as our invention, and desire to secure by Letters Patent,is

The arrangement of the needle-die, the looper, and the stationary fingerin such relation to each other as herein described, for the pur' pose ofextending the loops in a position for the needle to enter them withoutfailure.

,J. E. AIWVOOD. J. C. ATVVOOD. O. ATW'OOD.

Vitnesses:

EVANS PARISH, EUGENE A'rwooi).-

